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Originally Posted by Hollowcreek
5W20 is only recommended in any thing to help raise Ford's CAFE (Corporate Average Fuel Economy) . I would'nt use it ever, unless I lived somewhere very cold. Good ol 10W30, 10W40 or 15W40 is actually better protection regardless of how often you change your oil, however it may result in a small reduction in gas mileage.
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Where on earth did you get this information???? So 5w-20 is now a Ford plot to save money...WRONG! I'd like to hear your answer for why Honda started using it before anyone else and Dodge has been using it in some of their vehicles for several years now. AND I'd like to hear your answer for why Honda will soon start using a 0w-20 oil??? Well???
Lighter(thinner, less viscous, whatever you want to call it) oils are being used these days because the clearances in the engines are much more precise and are becoming increasingly efficient. How do you think they squeeze 150+ HP out of a 2.0L 4 banger. These lighter oils allow good lubrication under those conditions because the weight allow the oil to flow more easily into those extremely tight places. I would use what the manufacturer recommends, and most(manuf.) do say that if 5w-20 is not available to use 5w-30.
As for the oil change shop...they may have actually put in 5-20 or 5-30 and just had 10 on the invoice. If you are concerned, go back and ask them to change the oil again - this time using 5-20. Any shop worth it's salt w/ do this w/o question. If you have any other questions let me know. Hope this helps. M.